CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 402,729	$ 392,975	$ 782,201	$ 737,492
Cost of goods sold	219,407	203,360	421,189	371,980
Gross profit	183,322	189,615	361,012	365,512
Operating expenses:
Research and development	36,945	35,126	73,356	69,900
Selling, general and administrative	81,165	83,958	165,067	159,327
Total operating expenses	118,110	119,084	238,423	229,227
Earnings from operations	65,212	70,531	122,589	136,285
Interest expense	4,360	3,358	7,807	7,019
Interest income	(328)	(295)	(588)	(542)
Other expense (income), net	1,327	1,020	(103)	320
Earnings before income taxes	59,853	66,448	115,473	129,488
Income tax provision	14,485	15,948	68,980	31,078
Net earnings	$ 45,368	$ 50,500	$ 46,493	$ 98,410
Earnings per share:
Basic	$ 0.33	$ 0.36	$ 0.34	$ 0.70
Diluted	$ 0.33	$ 0.36	$ 0.33	$ 0.70
Weighted average shares outstanding:
Basic	137,861	140,063	137,686	139,916
Diluted	138,993	141,491	138,832	141,484